A boy sits 2.00 meters from the center of a merry-go-round with an angular speed of 1.40 rad/sec. If the magnitude of the force that maintains the boy's circular motion is 160 N, what is the boy's mass?

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

The movement of electrons between atoms is called an

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.